Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb5953f8b8eeb439d45ea78b08bef07b6ff1fb91a649d0cb2013c277068a0be' 
  AND token = 'g+puE1N+cLFhv/wgz9EGX+uwnnf3dkP4QvxD/c1N/2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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