Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e223d1f6634fcf07187c144fb32a826f3d81fcfc90e020416da142b4ed42d57f' 
  AND token = 'bGSTqcKC+DBUc2S/MbgZL2PdLn1DvAOKLyDl9fkb6+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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