Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af7cdde5f5c9b79478bf043a9f82e875c6436e89884dedadec8f303b9624f0b' 
  AND token = 'e/3LpGyl3t0daYAkSsGAMZkz61sPTcdGcZSEZawHOxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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