Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8103b99a61355ff17b5730338a18adfa7b3cfb9a1989351fa9e85ec3c1a0c5' 
  AND token = 'JWlTtiO4b+Sv4XmPFiP1oTNtwUjYCuwQow00gy6m/+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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