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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '16e1a172f30208717d67858e61eedd2d235dcc09f67067d75652db9870cb28f5' 
  AND token = 'HzNRg5gp2Lvy7CgtQN5UBoyix0l0omP7SnJ6xiQaUVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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