Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53067c133c2ab22305e7b21feee81b2e1b9916b6bf55c4a603ec5c9f8a48a30' 
  AND token = '7aR3hsRi6D0aw7kCnv2TAfYhYCQBCB9QFNBuv2Q8w9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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