Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf81871e949f547e488f682192c845efe57043acc28c3d0c8c81f5193c2bcab' 
  AND token = 'n3PO2AaJQaNoQIhr3+GajQq++n1b544DlEmDl+kRqUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}