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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a26dd14742adb5d078230f142b3372f0da5bb3b6c00db25a6d73de52fefa46c9' 
  AND token = 'KTOhAYE4JdRB1bSTSv0005rS7wnrufGH63xY7AK3CJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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