Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd4ab6293eeb08c623429e5b9ed3fa2bdcfe7a38aec2395db9941661cb7e49a' 
  AND token = 'aK7/MNXBWynFalypDWE1mkjyDY8XNG8jh4UsORXjm1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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