Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207260fca76a9883aace17a9d3c12dcdeb7d527e1dd9f068efd676ced687f61c' 
  AND token = 'UB1rbiv31BB7oVE7rijeEqjOWEtXDGf89P2cklPr7KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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