Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341b88a0c7c7e2646c3f9b6ecd6cbbfd4e79ea6a2681d5e57c673c6b0c6bfd3f' 
  AND token = 's6f1UGKwt26suCUU6uL5N53nT6q+rYQja53GK7Neqik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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