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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8628936229021bcbc8ea7f88f19030700c6b4a42738d98f2605d3c1c01023ed6' 
  AND token = 'tQy5kiDvtbWmj1nVx6WogHcjAV3Emqp6jWp6yauzqME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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