SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '49040978c40f40bd9c78013dfbcd878f474b39a116af349a730fa0134b0635d1' 
  AND token = 'gGIB0tLvq2Sf1i3KGZ2TzEQnTeVjMAEX9vu+Ai1ALlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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