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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6eee77db78a09c40568d0ff06a24a3e1c2cefda3b9dc636a7b5e089c59d328ed' 
  AND token = '8JzGxwUu2QmpTs2N48BWJdS2ORnv4nmkWkLeSUF1SW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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