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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '941a66f697f8be2b266aa31fd739e278815285c450353d98d58c3b1d197de88b' 
  AND token = 'w33B9MVC1XhDlfTPNMqY0s2davTiNpemSLqTfs3mC1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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