Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f914feee52acc8a6a2ed849f75dd84dc6cf67d2026d5699fc02be6bbffce0e' 
  AND token = '37RYD/m/YakUy8ZtT7wgcDx5hDukydaVJbQnMO8AkPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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