SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cfbee5020e02de8881301dc937f3a21b4272bf075ed74c78b60cfb8ffa77d06a' 
  AND token = 's3CWXXp/LOUHSnPSiCflET6hPrLYKUJJEbLGd7L2Bmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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