Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4770f6f694ab7017e8d759d292afc01437ca982b945d91597b046beb8d1e72c' 
  AND token = 't3N6p898ydUERwiZDwabGBnRFMAD7Dgo6fsODudgZpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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