Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8ed61aae9e8f46d2802fec5a1c68cc20767b0e3b206937481593f753c86ea7' 
  AND token = 'OQez/wEyP03mBGftkcxb7aHk8b8WYf0VWGxqmR8byhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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