Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b998639de632421c38050d682b033772f24ff1505ff2038f97eba97f8e82ad6f' 
  AND token = 'xPGb8x7dO9bjnLfowkAVRP+ZunmXXb65u+dtiykPn4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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