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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e23bb21233f69e5dd8ed9d91be2db7e5cad9c9f07891405572f766cca8a49acb' 
  AND token = 'WjQFD+F0XH11qKoS7z4OwMO0+tsP062f09KnqM+/qew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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