Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e6a6469adfd7562b247580328a4e7a3aaf1ffabbdc421b8a4162cbbe04c4c9' 
  AND token = 'xqbIqg3fUcpzUC3d9bDQT5ajaZD8o3/VdOD+VadD6a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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