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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f40325f5ee6077bd8cf865bedbd7c7ac62507c99193aabbc0b1c5643288db3de' 
  AND token = 'CqjSMNXAB0OU1vFUcN52Ja348Y44tMvOyBWZa+fZYfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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