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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a3b8435eb361b6f37c16128a98f5c488ca9969c4bdf793270b515287c50b5b58' 
  AND token = 'IQrolCj7Xtl7XPpZsEhe9tnzU7FcSM/Qh7pRGiuVsiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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