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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '378d4c8c71ddb235988078beae47bcc9f87629d6a3360db534a336d9f394090d' 
  AND token = '7mFn6anlk7WvhkU8zr1Zms49MQcTZnxezCLMZvwdW2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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