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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f6c09c1ed17f9c5c954a3c042ff96ce416bf338b1481ac62f391dc2f7cda1ea9' 
  AND token = 'O6Hjo2PjVYPpbhUP0oLoAKsJXntqCOE50YVvJj7d460=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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