Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f25ef504a7092ed442948dd43bf4b3c8216fd88f1b5ac833a9ab3945c8f7f74' 
  AND token = 'uc/hcM5XeJfWZKUigjB+MG5ymiGaoXoWJMrgratajnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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