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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fd39446a4f54c5abb980eb4d2e6a7a78bcd3f1089592298f015b2fc44468894a' 
  AND token = 'Y5nd2ES20Jm9Vr/9KFndPFmeG32g4SPj6S4pYxP1xfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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