Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0267af6770d7bd10d517cf992e3041ae26f949cf40a0929a506c7cdfa2d0e5d' 
  AND token = 'ADgpphoYj7ZRwVehCC/TxmBGO9lRE29Dj1e27a/l7r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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