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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e6c577c88c105e1f29a03d2f150d593ba00d851e140d822f91d1d977fe8cb077' 
  AND token = 'N5HM0oU8JKmg5BiEoQVj2yqA7p0SbwEtXN3TW82CUtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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