Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbccc7f78568fabdf5630fbe35695261cb2f0e7d946eff68650cc3bb0cf3bbd' 
  AND token = 'OiAGAy4k2mpf2yXDU9N6ycKKsGD7jnEjxis5m9Dlws8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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