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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '65eb70bc910b2a898a7614233580056b6dcbda4e75c9a997dccf4bbfa01407fb' 
  AND token = 'aOV2ZSJziSb4cWEhceWVMqPlw0WHPIkDNqcRW7GNi6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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