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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53b869120d64cb1fc5e9c13a4d86480d9f58706625933c170c3fb3ac0033ce39' 
  AND token = 'IBQKJkr7cd6xcXv3V3oYO+MpsxSaoRxqkPEIwsFtRlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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