Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475bdfe13cce43eeb885159d7754c79d228127d392a0db6c980ffbc4427a93aa' 
  AND token = 'UIThElo8vcYH2WOYNM3j7MZS3lb9UR4by9rMEnxvYNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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