SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fee9f8fb54785f3e2465819c84f3192a813e539fbc865376fe3572103328d8ff' 
  AND token = 'KFgKCLvLczBytNl1QaSNrWa1uiyogKjppzKnu0+q7QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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