SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '35e9fd0706142eeccc5cfe80d7fb3ca14835f5b7fa879efe435908d0090f81a5' 
  AND token = 'Glup8ihPN8Yg44EiqrUtlgZV3ST3z1b+k1AvSFWVzYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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