SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e494b5714894c4c3edd91b2b1faa745c694eab288646a8ed06b985b2f22b238' 
  AND token = '/0tgS+KYPFClSoejJ2h7/skZV85uIfvHuMoQ10tt6Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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