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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a611cc69ce10a509b83b5e6e3a85864bced6a43437e402f3328d8e9890a89e62' 
  AND token = 'q+Kv9g5w45Q++ynFXqmwgDcRMvQsQ9XEwMownF6gQxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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