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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '13d922aedc05c21bb0bfa2934a18911365418b526b8a2ee726efe37105721462' 
  AND token = 'QiGaPGhdPe6nY/PNQ51qo3bhavoubjqGhXVszkYyGeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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