Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c943dd0a933627ca0c3e43e20c18de3f217846d5fc8f3fc222ce1ab8d78a49' 
  AND token = 'z8Ad7a5O0JJkBiG4g2ubggNdnQSpWyi3kQghfNNHTRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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