Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46bb901f37d02f0fed6b1b43fc3d3b99ab7e93ed72b2528fe1d918d5c2f1a7b' 
  AND token = 'NfnbpQR5HD+NoS4HpKW0sSE0JUvKikkafyyMpChyUkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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