Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9fc6b80f1b802975b52e6ff0ae668540cb0b9b7d0aefa0b5ce689732d848e5' 
  AND token = '16gDpfYzzQKGKY1itJ7yxCl1A7l49NZ/Ztak9/0/LPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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