SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '025b5dfa6bd570bc2068aabaae9cd049f2888f5c0b3414c8481dd53743591555' 
  AND token = 'Clfzxe6JBiWIwYfXhcbKQspS8qrNiG99D20AoFnLkaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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