Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009e2ec79299b2b40d657cd65432fe12e9390ffda2306a8d5a4a47f5b1701fa9' 
  AND token = 'sgDWvRySRLtx8ih7lvkqYGh6eOABf7p8ra44NtZVUIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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