SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '07518c7e8dd0102df7a75bd60889f394d929d6b8af9336d99162f92ea4c0e305' 
  AND token = 'ONmrZ5j6PdcGN/O6dckng8QxyAK0+sRzBLYjY/d0ATs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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