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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9504dd99e3ef086a44ea9fb4c09466cee0e33b60c24d9a0b9d9585d6b289b3b6' 
  AND token = 'XHJLddhJw8v2ldOtYJ2hntppBTk0hfAlxPnq7cwD7TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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