Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2012191d2cdde80f1179291257ffd0a693a9e92962021b60322d1aba73377b3' 
  AND token = '8HxZ8m9w9aMkqgjZeoXMrOJe7hpE0gD69vHcfOyS9n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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