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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b292f9ade5eb1df3d729aa6eb596776b8acd610b655b0080d3459a9dd65c7002' 
  AND token = 'F1oKDZgUxkjHmuryZEy09EjuFVc7zf+q/ezHi7ecLEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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