SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '804855c7c9aea2b623a0162be99fdbd207c19abcf572c1957fa50c7707c5c769' 
  AND token = 'vhb0dXj9iVJVYijKGwqFeMf9pcSwh2z1GT+NSCUXfn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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