Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66526ba3ca07949e07d653988dc6e3775718dfb90c3876ff13f536e5e0dcb233' 
  AND token = 'QiSrNTStF7Tx6WjQQ38hLfEzVAfFhikPvyPfzP97PD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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