Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f2c1a37eb19fc257f5e64a4dfa5005f130e33e0fd85ccfeb32c6275362ed42' 
  AND token = 'A9zL07mVNeQJ331Q8zDxYVaLNj5cSqWPP+JSw/DSuhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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