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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd8f05fccabe917e19dddf12e423d4b96753bf57dfb24de8d33e825cb7d1b7336' 
  AND token = '44kPGL+Uae1ZZ06Ou18HOi4ECVwLxhQ7WUMtXcbh3ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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