Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1733be5ff886efcb39a7e084d1539e994a39fc61c2d554eba8f6f1e3ef2cd915' 
  AND token = 'FiYDRmsOtQ3uI+jrLrlgjuHj+l25XSMOYCT1m4SAeis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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