Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78875243e32b72feb0d56afa92774ff3620ad9d4f8c64b5ce6c9542d4c9c0f00' 
  AND token = 'oPkNQmtijYoXMTLNLUgcY+xJG6uvYCj93koN1e4d4X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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