Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f4b9ea503a258e176a1134a0a85567140d65ebf7a9c05e1e5e73b84149bd64' 
  AND token = 'hAi1lEietAiS6Ul+fhnvpxMZ5VY3tpaEWeoKZk042Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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