SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b280f913804f2118f94e9098b8e3770c2efa8c733deb3e7e44a2e07b94cb6436' 
  AND token = 'zMQhy1vIogxjmKXN/yV4Grk8wveSQ2LKjSRF+O5tNL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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