Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55c86ec4b32ee64fa735d4d9ec0295bdadebb5f352ed02e2bd2ab43469800bc' 
  AND token = '9i4PGeyFlPs2NMG/EO7b4DNV3Fdy1JN1Pfeg3bZ9WBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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