Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e6e30182d16a0f2143927ee46322af92024753e83387d6333a6d947ec02ac6' 
  AND token = 'RK5NajWsPqfy97RnUo5h1vZRQVBCQ3Rb0H04UrJxqJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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