SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fd690693db5eb4463efbb6c120cce6f6aa7f3a3d174c6270364c0479f3cd8920' 
  AND token = 'Dy32fZG2cBmgdv93T/2i8kdKlwNDbRhqAO5nY74Urnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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