SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'af190f91367f093187e7ef1d99629f6ef88033022b46a267bdd36b78e42b3e29' 
  AND token = '5R1QYXRiQNzdEPt/cb+WhJvtwcKzPDgzGbAaz4MZdoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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