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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bfd103aef046424f3fded52f0cbe07efeaebf2ada78dd94f6551b3a6c6a11f37' 
  AND token = 'uUlXsn63Awfu9qWvwVPKoAhseWMCOgGQwN673fbrB3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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